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Bit-Wise Unequal Error Protection for Variable-Length Block Codes With Feedback

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4 Author(s)
Nakiboglu, B. ; Dept. of Electr. Eng. & Comput. Sci., Univ. of California Berkeley, Berkeley, CA, USA ; Gorantla, S.K. ; Lizhong Zheng ; Coleman, T.P.

The bit-wise unequal error protection problem, for the case when the number of groups of bits l is fixed, is considered for variable-length block codes with feedback. An encoding scheme based on fixed-length block codes with erasures is used to establish inner bounds to the achievable performance for finite expected decoding time. A new technique for bounding the performance of variable-length block codes is used to establish outer bounds to the performance for a given expected decoding time. The inner and the outer bounds match one another asymptotically and characterize the achievable region of rate-exponent vectors, completely. The single-message message-wise unequal error protection problem for variable-length block codes with feedback is also solved as a necessary step on the way.

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Information Theory, IEEE Transactions on  (Volume:59 ,  Issue: 3 )